Structure for improving air inlet loss of adjacent fans of multiple fans

Abstract

The invention relates to an air inlet loss improvement structure for multiple adjacent fans, and aims to solve the technical problem that the improvement of the air speed attenuation by enlarging the distance between the adjacent fans in the conventional similar products cannot be realized in products with limited layout sizes. The key point is that the two same adjacent fans of the structure adopt a symmetrical rotating layout mode, and the air inlet speeds perpendicular to the radial direction and the axial direction at the adjacent air inlet positions are arranged in the same direction on the two sides; the circles of the two same adjacent fans are symmetrically arranged along a symmetric line between the circles, and the symmetric line is provided with an air guide spacer block which is arranged in an oblique line with the height of h and the angle of beta; the air guide spacer block passes through an intersection point of a symmetric line of the two same adjacent fans and a center connecting line of the two same adjacent fans and rotates towards an air inlet radial speed direction to form an oblique line of an angle beta with the symmetric line, or passes through a tangent line of a curve formed at the intersection point and forms an angle beta with the symmetric line; the air guide partition blocks are ribs, and the two identical adjacent fans are arranged in the same rotating direction or different rotating directions.

Description

Technical Field

[0001] The invention relates to a heat dissipation fan, which is a structure for improving air inlet loss of adjacent fans of multiple fans. Background Art

[0002] At present, cooling fans are often integrated into multiple fans in actual applications due to insufficient air volume in a single unit. However, when multiple fans are in operation, each fan often uses the same model of fan, which often causes the velocity gradients of adjacent fans perpendicular to both the radial and axial directions to change drastically at close proximity, thus generating a local high pressure gradient, making it more likely that airflow separation and vortex will occur in that local area, causing the local air intake volume and fan characteristics to decay. For this reason, some similar multi-fan products have partitions between adjacent fans, such as the authorization announcement number CN210129193U disclosed in the Chinese patent literature, the authorization announcement date 2020.03.06, and the utility model name "a tool-free installation server fan module". The fan bracket of the server fan module is installed inside the chassis, and adjacent fan frames are separated by partitions. However, although the above-mentioned products and similar products can improve the attenuation by increasing the distance between them, this cannot be achieved in products with limited layout size. At the same time, the poor design of the partition structure leads to airflow separation / vortex caused by the large circumferential velocity gradient in adjacent areas of multiple fans, and it is difficult to control the space occupancy due to the limited layout size. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the present invention is to provide a structure for improving the air inlet loss of adjacent fans in multiple fans in the art, so as to solve the technical problem that the existing similar products can improve the wind speed attenuation by increasing the distance between adjacent fans, but cannot be realized in products with limited layout size, resulting in high production cost and inconvenient production and preparation. The purpose is achieved through the following technical solution.

[0004] A structure for improving the air inlet loss of adjacent fans with multiple fans, characterized in that the two identical adjacent fans of the structure adopt a symmetrical rotation layout, and the air inlet speeds perpendicular to the radial and axial directions at adjacent air inlet positions are arranged in the same direction on both sides; the two identical adjacent fans are symmetrically arranged along the symmetry line between each other, and at the same time, an air guide block with a height of h and an oblique line arranged at an angle of β is provided at the symmetry line; the air guide block passes through the intersection of the symmetry line of the two identical adjacent fans and the center line of the two identical adjacent fans, and rotates in the direction of the air inlet radial speed to form an oblique line of β with the symmetry line, or the tangent of the curve formed at the intersection through the intersection forms an angle of β with the symmetry line. Thus, the above-mentioned air guide block is a rib, and the two identical adjacent fans adopt the same direction or different direction arrangement, and the two ends of the air guide block are respectively tilted in different directions to form an S-shaped β-angle oblique line arrangement, or the two ends of the air guide block are respectively tilted in the same direction to form a C-shaped β-angle oblique line arrangement, which reduces the space occupied and meets the requirements of improving the attenuation between adjacent fans under the condition of limited layout size.

[0005] The angular range of the β angle is between , where r is the radius of a single fan and d is the distance between the air inlet circles of two fans

[0006] The height h < 7.7%r, and the air guiding partition block is lifted axially.

[0007] The two identical adjacent fans adopt the same rotation direction or different rotation directions. That is, the two identical adjacent fans are arranged in such a way that the rotation directions of the fan blades are the same or different, such as the fan blades all rotate clockwise, or one rotates clockwise and the other rotates counterclockwise.

[0008] The air guiding partition block is the air inlet velocity gradient on the adjacent sides of two identical adjacent fans, and the height by which the air inlet of one side fan is higher than the air inlet of the other side fan is the h.

[0009] The above structure relates to the layout and structural improvement of the air inlet loss of adjacent fans in a multi-fan system. Based on the fact that in existing similar products, multi-fans in adjacent areas are prone to air flow separation / vortex caused by large circumferential velocity gradients, this structure improves the technical problem of the decline in air inlet performance caused by the mutual interference of the air inlets on both sides through two methods: changing the air inlet velocity gradient on the adjacent sides by the rotation direction of the fans or shielding the mutual influence by an additional air guiding structure.

[0010] The structure design of the present invention is simple and reasonable, occupies a small volume, and has a wide application range, that is, it can be used for multi-fans with the same rotation direction and different rotation directions; it is suitable for use as a structure for improving the air inlet loss of adjacent fans in a multi-fan system and for the further improvement of similar products. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic diagram of the structure that can avoid excessive circumferential velocity gradient of fans with different rotation directions of the present invention.

[0012] Figure 2 is Figure 1 a table of the ratio between the air inlet surface distance of the fan and the attenuation of the air inlet flow rate.

[0013] Figure 3 is Figure 1 a circumferential air inlet flow velocity distribution curve graph of the diametrical direction coordinates.

[0014] Figure 4 is Figure 1 a table of the ratio of the attenuation of the air inlet flow rate of the circumferential velocity distribution with the same rotation direction and different rotation directions.

[0015] Figure 5 is Figure 1 a table of the ratio of the attenuation of the air inlet flow rate of the influence of whether a guiding air partition block is added on the performance attenuation with different rotation directions.

[0016] Figure 6 Yes Figure 1 Top view structural schematic diagram of the influence of the air guide partition blocks with the same rotation direction on performance attenuation.

[0017] Figure 7 Yes Figure 6 Three-dimensional structural schematic diagram of the influence of the air guide partition blocks with the same rotation direction on performance attenuation.

[0018] Figure 8 Yes Figure 6 Circumferential inlet air velocity distribution curve graph of the diameter direction coordinates.

[0019] Figure 9 Yes Figure 7 Enlarged structural schematic diagram at the air guide partition block.

[0020] Figure 10 Yes Figure 7 Three-dimensional structural schematic diagram of the height at the air guide partition block.

[0021] Figure 11 Yes Figure 7 Three-dimensional structural schematic diagram of the width at the air guide partition block, and the width position in the figure is enlarged.

[0022] Figure 12 Yes Figure 7 Three-dimensional structural schematic diagram represented by another line.

[0023] Figure 13 Yes Figure 12 Improved structural schematic diagram, where the air guide partition block in the figure is replaced by the adjacent side inlet air velocity gradients of two identical adjacent fans.

[0024] Figure 14 Schematic diagram of the local air inlet volume and the fan characteristic attenuation structure of adjacent fans in different rotation states in the prior art.

[0025] Figure 15 Yes Figure 14 Spectrum diagram of the influence of the air inlet strength at the junction.

[0026] Figure 16 Yes Figure 14 Circumferential inlet air velocity distribution curve graph of the diameter direction coordinates. Embodiment

[0028] Now, in combination with the attached drawings, the structure and use of the present invention will be further described. As Figures 1 - 16 shown,

[0029] The specific structural design of this structure is as follows:

[0030] 1. Two identical adjacent fans adopt a symmetric rotation layout. The air inlet velocities perpendicular to the radial and axial (circumferential) directions at the adjacent air inlet positions are set in the same direction on both sides, so that large gradient changes will not occur, and the attenuation of the air inlet volume is improved.

[0031] 2. If it is difficult to change the fan rotation direction in a local situation, by adding a wind guiding partition block in the adjacent air inlet area of two identical adjacent fans to isolate the two sides with large gradients, the mutual interference between the two sides can be controlled. The basic form of the wind guiding partition block is a slant line that passes through the intersection point of the symmetry line of two identical adjacent fans (the circles of two identical adjacent fans are symmetrically arranged along this symmetry line) and the connection line of the centers of the two identical adjacent fans, and rotates in the direction of the air inlet radial velocity to form an angle β with the symmetry line, or a curve formed at the intersection point, and the tangent line of the curve at the intersection point forms an angle β with the symmetry line.

[0032] If in the form of a slant line, the angle range of β is between them, where r is the radius of a single fan and d is the distance between the air inlet circles of the two fans.

[0033] The wind guiding partition block is lifted slightly in the axial direction, and the height h < 7.7%r. While avoiding excessive blocking of the inflow, it isolates the local air inlets on both adjacent sides, and has a wind gathering effect in the air inlet direction, achieving the problem of shielding the excessive circumferential velocity gradient difference between adjacent fans, improving the local air inlet volume, and thus optimizing the fan performance.

[0034] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent replacements or changes, and should be covered by the protection scope of the present invention.

Claims

1. A structure for improving the air inlet loss of adjacent fans of multiple fans, characterized in that The two identical adjacent fans of this structure adopt a symmetrical rotation layout, and the air inlet speeds perpendicular to the radial and axial directions are arranged in the same direction on both sides at adjacent air inlet positions; the two identical adjacent fans are symmetrically arranged along the symmetry line between their respective circular edges, and at the same time, an air guide block with a height of h and an oblique line arranged at an angle of β is provided at the symmetry line; the air guide block passes through the intersection of the symmetry line of the two identical adjacent fans and the center line of the two identical adjacent fans, and rotates in the direction of the air inlet radial speed to form an oblique line at an angle of β with the symmetry line, or the tangent of the curve formed at the intersection at the intersection forms an angle β with the symmetry line.

2. The structure for improving the air inlet loss of adjacent fans of multiple fans according to claim 1 is characterized in that The angle range of the β angle is Where r is the radius of a single fan and d is the distance between the air inlet circles of the two fans.

3. The structure for improving the air inlet loss of adjacent fans of multiple fans according to claim 1 or 2, characterized in that The height h is less than 7.7% r, and the air guide spacer is lifted in the axial direction.

4. The structure for improving the air inlet loss of adjacent fans of multiple fans according to claim 1 is characterized in that The two identical adjacent wind turbines adopt the same rotation direction or different rotation directions.

5. The structure for improving the air inlet loss of adjacent fans of multiple fans according to claim 1 is characterized in that The air guide spacer is the air inlet velocity gradient on the adjacent sides of two identical adjacent fans, and the height of the air outlet of the fan on one side is higher than the air outlet of the fan on the other side by the height h.

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